<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        window.onload=function(){
            var send=document.getElementById('send'),
                    times=60,
                    timer=null;
            send.onclick=function(){
                // 计时开始
                timer=setInterval(function(){
                    times--;
                    if(times<=0){
                        send.value='发送验证码';
                        clearInterval(timer);
                        times=10;
                        send.disabled=false;
                    }else{
                        send.value=times+'秒后重试'
                        send.disabled=true;
                    }console.log(times)
                },1000)

            }
        }
    </script>
</head>
<body>
    <input type="button" id="send" value="发送验证码">
</body>
</html>